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watch -n 0.2 ./send.shI discover that after few calls or when sendCTRL+Csignal and re-execute it, my output data are printed in oddly way. The reason is about left cat-s process that have simulations access to my port. You can list that bylsof /dev/ttyUSB0So I addlsof -t /dev/ttyUSB0 | xargs -r kill -9at the beginning, to be sure that only one cat process exists in a given runtime of my function.exec 3<and thenstty. Opening the device (withexec 3<) locks it into an “open” status, which should ensure that settings are persistent. If you do thesttyfirst, the device will be closed and the settings might be reset.